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colocation
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Choose master/slave by using a different power connector.

Write speed: 1.4 MBytes/s

# time dd if=/dev/zero of=zero bs=1048576 count=20
20+0 records in
20+0 records out
20971520 bytes transferred in 14.595191 secs (1436879 bytes/sec)
0.000u 0.118s 0:14.61 0.7%      210+6787k 1+163io 0pf+0w
# reboot

Read speed: 2 MBytes/s

# time dd if=zero bs=1048576 count=20 > /dev/null
20+0 records in
20+0 records out
20971520 bytes transferred in 10.006177 secs (2095857 bytes/sec)
0.000u 0.070s 0:10.00 0.7%      11249+363281k 163+0io 2pf+0w

id

# dmesg|grep DiskOnModule
ad0: 250MB <PQI IDE DiskOnModule> [1000/16/32] at ata0-master PIO2
# dmesg|grep ATA100
atapci0: <Intel ICH4 ATA100 controller>
port 0xf000-0xf00f,0-0x3,0-0x7,0-0x3,0-0x7 irq 12 at device 31.1 on pci0